Production method of electrode catalyst, electrode catalyst, composition for forming gas diffusion electrode, gas diffusion electrode, membrane-electrode assembly (MEA), and fuel cell stack
a production method and catalyst technology, applied in the field of electrode catalysts, can solve the problems of shortening the life of the fuel cell, reducing the catalytic activity of the core-shell catalyst, and affecting the production efficiency of the catalyst, so as to reduce the catalytic activity of the electrode catalyst and reduce the manufacturing cost. , the effect of simple operation
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working example
[0266]The present invention is described in greater detail hereunder with reference to working examples. However, the present invention is not limited to the following working examples.
[0267]Here, the inventors of the present invention confirmed that iodine (I) species was not detected from the catalysts of the working and comparative examples, when employing the X-ray fluorescence (XRF) spectroscopy.
[0268]Further, unless otherwise noted in the description of each step of the following production method, these steps were carried out under a room temperature and in the air.
Production of Electrode Catalyst Precursor
production example 1
[0269]The electrode catalyst was produced by the electrode catalyst production method of the present invention through following process. The raw materials of the electrode catalyst that were used in the production examples are as follows.[0270]Carbon black powder: product name “Ketjen Black EC300” (by Ketjen Black International Co.)[0271]Sodium tetrachloropalladate (II)[0272]Palladium nitrate[0273]Potassium chloroplatinate
[Preparation of Palladium-Supported Carbon]
[0274]As a support of the electrode catalyst, there was used a carbon black powder which was dispersed in water to prepare a dispersion liquid of 5.0 g / L. An aqueous solution of sodium tetrachloropalladate (II) (concentration 20% by mass) of 5 mL was then delivered by drops into and mixed with such dispersion liquid. An aqueous solution of sodium formate (100 g / L) of 100 mL was further delivered by drops into a dispersion liquid thus obtained, followed by taking the insoluble components through filtering and then washing ...
production examples 2 to 6
[0280]Electrode catalyst precursors 2 to 6 of production examples 2 to 6 were respectively obtained in a similar manner as the production example 1 except that the supported amounts of platinum (Pt) and palladium (Pd) contained in the electrode catalyst became those represented by the concentrations (% by mass concentration) as set forth in the working example 7, comparative examples 3 to 5 and comparative example 2 of Table 1.
[0281]As described later, as for the electrode catalyst precursors 1 to 6, it was confirmed that their chlorine (Cl) species concentrations, as measured by XRF spectroscopy, were not lower than 6,000 ppm as set forth in Table 1.
[0282]Thus, in the following working examples, the first chlorine (Cl) species concentration of the electrode catalyst precursor as the raw material is 6,000 ppm.
Production of Electrode Catalyst
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